JPH0342259Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a sliding bearing unit. The sliding bearing unit of the present invention is particularly effective when used in small diameter bearings such as small electric motors, office equipment, fishing reels, small conveyors, and the like.

[Prior art]

Conventionally, small plain bearing units with oil-impregnated bearing metal have been considered self-aligning, so even if self-aligning is not required, self-aligning plain bearing units must be used. In general and conventional plain bearing units, the lubricating oil used for lubrication during use is limited to the oil impregnated in the spherical oil-impregnated bearing metal.
There were disadvantages such as the low amount of oil, short bearing life, and the hassle of re-lubricating.

Therefore, in order to eliminate such inconveniences, the present inventor devised a sliding bearing unit that does not require replenishment of lubricating oil, can extend the bearing life, and can be of a non-aligning type. Jitsugan Showa 62-
This is the sliding bearing unit of No. 177254.

[Problems with conventional technology]

However, although the above sliding bearing unit has a simple structure including an outer cylinder and an oil-impregnated bearing metal,
The outer cylinder is constructed by bending both ends of a cylindrical part made of thin steel plate inward to provide a brim-like part, so if the wall thickness is thin, the strength will be insufficient, while if the wall thickness is thick, it will be difficult to press, etc. The problem was that it was difficult to process.

The present invention was developed against the background of these circumstances, and the purpose of the present invention is to extend the life of the bearing without requiring replenishment of lubricating oil, and to achieve a non-self-aligning type. Another object of the present invention is to provide a sliding bearing unit with an oil-impregnated bearing metal that can be easily machined while improving strength.

[Means for solving problems of conventional technology]

The present invention was devised to achieve such an objective, and the gist of the present invention is to provide an oil-impregnated bearing metal with an annularly recessed stepped portion on the outer periphery of both ends, and a thin-walled bearing metal. A cylindrical part made of a steel plate is provided with a collar-shaped part bent inward at one end, and a ring-shaped side wall part bent inward at the other end. an outer cylinder bent inward and provided with an annular metal receiving portion that can fit into one stepped portion of the oil-impregnated bearing metal; and an outer cylinder that can fit into the other stepped portion of the oil-impregnated bearing metal. a metal presser having a protruding annular metal receiving portion, the metal retainer being non-removably disposed within the outer cylinder and supporting the oil-impregnated bearing metal in cooperation with the metal receiving portion of the outer cylinder; An oil-impregnated material disposed in a space surrounded by an outer cylinder, a metal retainer, and an oil-impregnated bearing metal, and a sliding bearing unit configured.

[Effect]

In the sliding bearing unit configured as described above, the metal receiving portion of the outer cylinder and the metal receiving portion of the metal presser work to increase the strength.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

The sliding bearing of the embodiment shown in FIG. 1 is small in size, having the same dimensions as a small-diameter rolling bearing, but is shown enlarged. In FIG. 1, 16 is an outer cylinder, and one end of a cylindrical part 18 formed of a thin steel plate is bent inward to form an annular collar part 20, and the other end is bent inward to form an annular side wall. Part 2
2, and an annular metal receiving part 2 formed by bending inward over the entire periphery at the open end.
4 is provided in a protruding manner so that it can be fitted into a stepped portion 28 of an oil-impregnated bearing metal 26, which will be described later. The oil-impregnated bearing metal 26 has a cylindrical outer peripheral surface on the outside, and annularly recessed stepped portions 2 on the outer peripheral sides of both ends.
It is a member made of a sintered alloy in which numbers 8 and 30 are formed,
It is arranged inside the outer cylinder 16.

In addition, as shown in Fig. 2, the oil-impregnated bearing metal 26
(In this example, 4 on each side, 8 in total)
Two oil grooves 32 are alternately carved from the outer circumferential portion toward the stepped portions 28 and 30.

A metal presser foot 36 having a metal receiving portion 34 is disposed on the opposite side of the side wall portion 22 within the outer cylinder 16.
In cooperation with the outer cylinder 16, an oil-impregnated bearing metal 26 is supported concentrically with the outer circumference of the outer cylinder 16.
The metal presser foot 36 has a cylindrical portion 38 on the outside that can fit into the inner peripheral portion of the outer cylinder 16, and an annular metal receiving portion 34 on the inside, and both are connected to a stepped side wall. The metal receiving portion 3
4 cooperates with the metal receiving portion 24 of the outer cylinder 16 to restrict lateral movement of the oil-impregnated bearing metal 26 and to support the oil-impregnated bearing metal 26 concentrically with the outer cylinder 16.

Outer cylinder 16, metal presser 36, and oil-impregnated bearing metal 2
The space surrounded by 6 is filled with an oil-impregnated material made of fiber material impregnated with lubricating oil.

The sliding bearing unit 46 is constructed as described above, but the assembly is performed using the unfinished state of the outer cylinder 16, that is, the portion that will become the collar portion 20 is not yet bent and is the same as the cylindrical portion 18. After combining the cylindrical diameter and the oil-impregnated bearing metal 26 and filling the inside with the oil-impregnated material 42, the metal presser 36 is inserted, and then the portion that will become the brim portion 20 is bent. . As a result, the metal presser foot 36 becomes unable to fall off, that is, cannot be separated, and constitutes an independent unit. Note that the portion forming the brim portion 20 is made slightly thinner than the cylindrical portion 18, so that it can be easily bent.

In this way, the rigidity is increased by providing the metal receiving portion 24 protruding from the outer cylinder 16, so that the wall thickness of the outer cylinder can be reduced and machining can be facilitated. 20 Since one end side is held through the metal presser 36 rather than directly, it is assembled,
Processing is easier, and since there is no need to provide a spherical surface, the cost is lower than that of a self-aligning plain bearing unit. Furthermore, since the sliding bearing unit of this embodiment has the same dimensions as a normal rolling bearing, it can be used directly in place of a rolling bearing. Furthermore, this sliding bearing unit is structurally easy to manufacture with the same inner diameter, outer diameter, and width as rolling bearings of various sizes.
Therefore, it is possible to directly replace locations where rolling bearings were used. That is, they are compatible. Furthermore, it is easy to manufacture a sliding bearing unit that is even smaller than this embodiment. Furthermore, since it is made into a unit, it can be easily replaced in the event of a failure.

Slide bearing unit 4 configured as above
In step 6, the lubricating oil impregnated in the oil-impregnated material 42 passes through the gap between the sintered structures in the oil-impregnated bearing metal 26 as the shaft to be supported by the plain bearing unit 46 rotates, and is applied to the shaft. The surface is lubricated, and then by rotation of the shaft, the oil-impregnated bearing metal 2
The lubricating oil leaks to both the left and right ends of the metal receiving part 2, and this leaked lubricating oil moves outward due to surface tension, etc.
The oil enters the oil-impregnated material 42 through the gaps between the stepped portions 28 and 30 and the oil grooves 32 provided at both ends of the oil-impregnated bearing metal 26, and thereafter repeats such circulation.

In this way, lubrication within the plain bearing unit 46 is achieved. Therefore, since the lubricating oil in the sliding bearing unit 46 has a large content and is used in circulation, there is less loss to the outside, and the bearing life can be extended.

In the embodiment described above, the number of oil grooves 32 provided in the oil-impregnated bearing metal 26 can be further increased or decreased, and the length can also be changed. Furthermore, other known oil-impregnating materials may be used. Furthermore, the dimensions of the plain bearing unit of the embodiment described above can be made even larger or smaller.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and it goes without saying that the present invention can be implemented in various forms without departing from the gist of the present invention.

[Effect of idea]

As detailed above, according to the present invention, an annular metal receiving part is provided protruding from the outer cylinder and a metal presser having a similar metal receiving part is used, thereby improving strength and facilitating processing. You can aim for
Moreover, by sealing an oil-containing material inside, the amount of lubricating oil can be increased, and the life of the bearing can be extended. In addition, since it has a simple configuration, the number of parts is small, and processing and
Easy to assemble. Therefore, production costs can be reduced. Furthermore, since it has a simple structure, it is easy to manufacture it with the same inner diameter, outer diameter, and width as the rolling bearing, and therefore, it can be directly replaced and can also be made smaller.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention;
FIG. 2 is an enlarged perspective view of parts used in the same embodiment. 16... Outer cylinder, 18... Cylindrical part, 20... Flab-shaped part, 22... Side wall part, 24, 34... Metal receiving part, 26... Oil-impregnated bearing metal, 28, 30...
...Stepped portion, 36...Metal presser foot, 42...Oil-impregnated material, 46...Sliding bearing unit.

Claims (1)

[Scope of Claim for Utility Model Registration] Oil-impregnated bearing metal with annularly recessed stepped parts on the outer periphery of both ends, and a cylindrical part formed of a thin steel plate with one end bent inward. A collar-shaped portion is provided, and the other end thereof is provided with an annular side wall portion bent inward, and the open end thereof is bent inward and fitted into the stepped portion of one of the oil-impregnated bearing metals. an outer cylinder provided with an annular metal receiving part that can be fitted into the outer cylinder, and a protruding annular metal receiving part that can be fitted with the other stepped part of the oil-impregnated bearing metal; a metal holder that is arranged in a manner that it cannot fall off and supports the oil-impregnated bearing metal in cooperation with the metal receiving part of the outer cylinder; and a metal holder that is arranged in a space surrounded by the outer cylinder, the metal holder, and the oil-impregnated bearing metal. A sliding bearing unit equipped with an oil-impregnated material and .